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Growing organs in a lab

What if you could grow a custom-made organ in a lab? Growing lungs and other organs for transplant is still in the future,
but scientists are working toward that goal. In North Carolina, a 3-D
printer builds prototype kidneys. In several labs, scientists study how
to build on the internal scaffolding of hearts, lungs, livers and
kidneys of people and pigs to make custom-made implants. (AP)